This document summarizes the evolution of computers across five generations: Generation 1 was the first digital computer built in 1937-1939 by John Vincent Atanasoff at Iowa State University using vacuum tubes. Generation 2 introduced the transistor in 1959. Generation 3 saw the development of integrated circuits on a single silicon chip in the late 1960s. Generation 4 placed the entire CPU on a single microchip in 1970. Current Generation 5 trends exploit the ability to process thousands of computations simultaneously across thousands of interconnected computers.